/*
 * Copyright (c) 2017, 2021 Oracle and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.helidon.config;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import io.helidon.config.spi.ChangeEventType;
import io.helidon.config.spi.PollingStrategy;

import org.junit.jupiter.api.Test;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;

/**
 * Tests {@link PollingStrategies}.
 */
public class PollingStrategiesTest {

    @Test
    public void testTicksNop() throws InterruptedException {
        PollingStrategy pollingStrategy = PollingStrategies.nop();

        AtomicInteger count = new AtomicInteger();
        CountDownLatch onComplete = new CountDownLatch(1);

        pollingStrategy.start(when -> {
            count.incrementAndGet();
            onComplete.countDown();
            return ChangeEventType.UNCHANGED;
        });

        assertThat(onComplete.await(100, TimeUnit.MILLISECONDS), is(false));
    }

}
